A Microsoft Corp. executive said yesterday that his company's new office software will comply with a disputed Massachusetts government mandate requiring the use of ''open" data formats.Executives from rival software makers greeted the pledge with skepticism.But Massachusetts' chief information officer, Peter Quinn, who's leading the drive for the new data standard, said the Microsoft proposal will probably meet the state's demands.The Massachusetts standard, which takes effect Jan. 1, 2007, has attracted worldwide attention because it poses a major challenge to Microsoft Office, by far the world's most popular office software program. Up to now, Microsoft Office has used data formats...